This is the Mares X-WING Fiber Fins for Freediving Spearfishing Features: Blade produced with pre-impregnated fiberglass layers Variable blade thickness and high-performing parabolic flexion The blade is 195 mm wide and 670 mm long High-quality manufacturing process Variable side ribs support and optimize channel thrust and flex Available with a soft or medium strength blade depending to the user&&';;s weight Longer fins, adapted to medium kick frequency Indigo polygon blade 30Adeg blade inclination relative to the foot pocket The X-Wing foot pocket is also designed to be worn without neoprene socks Interchangeable blade construction The Mares X-Wing Fiber are the ultimate freediving fins, meticulously crafted with precision and durability in mind. Their responsive, lightweight fiberglass blades feature variable thickness and parabolic flexion for optimal power and comfort. With variable side ribs, they adapt to your movements underwater. Available in soft or medium strengths to suit your weight, these fins are perfect for a medium kick frequency. The X-Wing foot pocket is designed for versatility, accommodating use with or without neoprene socks.